Instructions / Assembly

page 7
MULTIPLE APPLIANCE SYSTEMS
WhenusingonePVOpowerventertocommon
vent more than one appliance, a Control Kit is
required for each additional appliance.
Connect the negative pressure port of each air 1.
pressure fan proving switch on all Control Kits
being used to the provided tee mounted on
thePVO.(SeeFigure4)
Remove the cap from the branch of the tee 2.
and use the ferrule and compression nut
provided in the small envelope with the PVO
to attach the connecting tube.
Refer to the instruction sheet included with 3.
each Control Kit for specific instructions for
that kit, including wiring diagrams.
AIR FLOW ADJUSTMENT
NOTE: Beforeinstalling,refertotheGeneral
Installation Inspection to check for negative
pressure problems in the building.
To adjust the power venter air flow, open the 1.
choke plate
1
⁄2 to
3
⁄4ofthewayopen.(See
Figure5)Followtheappliancemanufacturer's
procedures for starting the heating appliance.
Adjustthethermostattocallfor"Heat."After2.
the system has operated for several minutes
to stabilize flue gas temperatures, use a draft
gauge, velocity meter, or match test procedure
to check for negative draft or up-draft at the
heating appliance outlet or air flow into the
draft hood.
Adjust the inlet choke damper on the power 3.
venter in or out to obtain the minimum air flow
required to maintain draft. Then increase air
owslightly(10%overminimumairowrate)
to ensure proper venting. For power burners, adjust draft to proper over-fired draft. If using a barometric
draft control, use the draft control to fine tune the
system draft.
If proper draft has been established, secure the choke plate by tightening the screws on the inlet collar.4.
Shut off thermostat and check for residual heat spilling from the draft hood or draft control. If this occurs, 5.
increase the post purge time on the timer.
Figure 4
Figure 5
NOTE: After proper venting has been established, it is recommended that a combustion test and a smoke test
be performed to ensure maximum burner efficiency. Oil burner air adjustments should be set at a zero to a
trace smoke at the highest or recommended CO
2
%settingsetbyheatingequipmentmanufacturer.